RXW-LIA-868 HOBOnet PAR Sensor

Overview

Measures light intensity at frequencies relevant to photosynthesis. HOBOnet wireless sensors communicate data directly to the HOBO RX3000 or HOBO MicroRX station or transmit data via other wireless sensors to the central station. These sensors are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset's innovative cloud-based software platform.
Features



Sensor Features

• 0 to 2500 umol/m2/sec measurement range at wavelengths from 400 to 700 nm
• Encapsulated in an anodized aluminum housing with acrylic diffuser
  
  
  
  

Wireless Features

• 900 MHz wireless mesh self-healing technology
• Wireless range of 450 to 600 meters (1500 to 2000 feet) and up to five hops
• Up to 50 wireless sensors or 336 data channels per HOBO RX station
• One push of a button joins the HOBOnet wireless network
• Onboard memory to ensure no data is lost
• Powered by rechargeable AA batteries and built-in solar panel

Specifications

Sensor

Measuring range

0 to 2500 μmol/m2/sec, wavelengths 400 to 700 nm

Accuracy

±5 μmol/m2/sec or ±5%, whichever is greater under sunlight conditions; Additional temperature-induced error ±0.75 μmol/m2/sec/°C from 25 °C (0.42 μmol/m2/sec/°F from 77 °F)

Angular accuracy

Cosine corrected from 0 to 80 degrees from vertical; Azimuth Error <2% error at 45 degrees from vertical, 360 degree rotation

Resolution

2.5 μmol/m2/sec

Drift

<±2% per year

Wireless Mote


Operating Temperature Range

-25° to 60°C (-13° to 140°F) with rechargeable batteries
-40 to 70°C (-40 to 158°F) with lithium batteries

Radio Power
12.6 mW (+11 dBm) not adjustable


Transmission Range

Reliable line-of-sight connection from 457.2 m (1500 ft) at 1.8 m (6 ft) in height

Reliable line-of-sight connection from 609.6 m (2000 ft) at 3 m (10 ft) in height


Wireless Data Standard

IEEE 802.15.4


Radio Operating Frequencies

• RXW-LIA-900: 904-924 MHz
• RXW-LIA-868: 866.5 MHz
• RXW-LIA-922: 916-924 MHz
• RXW-LIA-921: 921 MHz
  
  
  

Modulation Used
OQPSK
Quadrature Phase Shift Keying with offset


Data Rate

Up to 250 kbps, not adjustable


Duty Cycle

<1%


Maximum Number of Motes

Up to 50 wireless sensors or 336 data channels per one HOBO RX station


Logging Rate

1 minute to 18 hours


Number of Data Channels

2

Battery Type/Power Supply

Two 1.2V AA NiMH rechargeable batteries, powered by built-in solar panel or two 1.2V AA NiMH rechargeable batteries, powered by built-in solar panel or two 1.2V AA NiMH rechargeable batteries, powered by built-in solar panel or two 1.2V AA NiMH rechargeable batteries, powered by

built-in solar panel 1.5V AA lithium for operating conditions of -40 to 70°C (-40 to 158°F)


Battery Life

With NiMH Batteries: Typically 3 to 5 years when used in a temperature range of -20° to 40°C (-4°F to 104°F) and facing the sun (see Deployment and Mounting); Operation outside this range will reduce battery life With lithium batteries: 1 year, typical use


Memory

16 MB


Dimensions

Sensor: 4.1 cm high x 3.2 cm diameter (1.61 x 1.26 in)

Cable length: 2 m (6.56 ft)

Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 in)

Weight

Sensor and cable: 109 g (3.85 oz)

Mote: 223 g (7.87 oz)


Materials

Sensor: Anodized aluminum housing with acrylic diffuser and O-ring seal
Mote: PCPBT, silicone rubber seal
Environmental rating
Sensor: Weatherproof
Protection: IP67, NEMA 6